Question
Which one of the following mineral is the main source of
Boron in soilsSolution
Tourmaline is the main source of boron; Pyrolusite is a mineral consisting essentially of manganese dioxide (MnO2) and is important as an ore of manganese; Magnetite is a mineral whose primary component is an iron oxide that contains equal amounts of iron(II) and iron(III); Muscovite is the most common mineral of the mica family.
52   83   114   ?   176    207
- What will come in place of the question mark (?) in the following series?
29, 32, 41, 68, ?, 392 7 12 33 ? 635 3804
...12, 25, 51, ?, 207, 415Â
12, 19, 33, ?, 117
8Â Â Â 8Â Â Â 12Â Â Â 24Â Â Â Â 60Â Â Â Â Â ?
9    14    38    129    ?   2705   16260
...Find the missing number in the given number series.
8, 9, 16, 11, 32, 13, ?4    9    28    99    ?   2105   12660
...25, ?, 87, 159, 269, 425Â
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